[R] Creating dummys in R

[David Winsemius]

On Nov 10, 2011, at 8:41 AM, Sarah Goslee wrote:

> Without having any actual idea what you mean (sample data!), this  
> might work:
>
> sex <- c(1,0,1,0)
> sex1 <- c(1,1,0,0)
> samesex <- ifelse(sex == 1 & sex1 == 1, 1, 0)

 > sex & sex1
[1]  TRUE FALSE FALSE FALSE
 > 0+(sex & sex1)
[1] 1 0 0 0


>
> Note that this does NOT return 1 if both initial variables are 0, so
> it isn't really a samesex indicator, but it is my best guess as to
> what you might want.
>
> Sarah
>
> On Thu, Nov 10, 2011 at 5:13 AM, David . <loovet88 at hotmail.com> wrote:
>>
>> Dear R-project!
>>
>> How do i create 1 dummy from 2 already existing dummys. To be more  
>> precise, I want to create a dummy from a dummy called "sex" and  
>> another called "sex1" when both thoose dummys are 1 I want my  
>> created dummy "samesex" to take 1.

-- 

David Winsemius, MD
West Hartford, CT